I am looking for these dimension from the flywheel 13-b RX-7 if someone
have one on hand uninstalled i would really appreciate those informations
see photo

Jean Prudhomme

  Which dimensions? hole spacing? Diameter? Hole size? How exact do you
  need... I happen to have one off the plane right now :-)
  -- David Leonard
  Dave you are insured. Sky Smith had the info on you. You are famous.
  As far as I can tell you can fly the RV4 anytime.
  Apparently two successful off airports counts for a lot :)
  I need a medical and and bi annual. Both have recently expired. I got them
 for
  flying in Oz.

  Paul Lamar


  Hi David i will need all holes diameter and holes circle so i can compare
 with
  the RX_8 flywheelThank's for your assistance


  Jean Prudhomme


  Jean, I received the damper plate today. All is well. Thanks.
  If someone hasn't already given them to you, I picked up my RX-7 flex
 plate from
  the hangar today. I will measure it tomorrow if you still need them.
  C. Smith


 C. Smith Thank's for your response of received the damper plate,yes i still
 need the holes dimensions on the RX-7 flywheel just to compare if both are
 interchangeable, but i found an idea to use the RX-8 flywheel and the
 standard Tracy damper but Paul recommend 4130 instead of aluminum plate but
 it will add a few pounds, you see the rx8 one  is design differently then
 the rx7 with those big holes away of center holes and closed to the ring
 gear and by using a bolted plate to the original holes 12mm the Tracy damper
 plate by attaching the rubber bushing holes and are line up with the rx8 big
 holes for the bolts head clearance.There is a sketch for this additional
 plate no welding and no balancing i guess it worth to try.


 Jean Prudhomme

Jean,

The center 6-bolt pattern is the same for the RX-7's and the RX8.  But that
is not the whole story. There are 2 different fly wheels (use with manual
transmissions) and 2 different flex plates (used with automatic
transmissions).  Divided thus:

"non-turbo" flywheel - used with all manual n.a. RX-7s  This is smaller
diameter than:
"turbo" flywheel - used with all manual turbo RX-7s and all manual RX-8's
RX7 flex plate - used with all auto RX7's
RX-8 flex plate - used with all auto RX-8s (and there is a cosmo flex plate
as well)
  -- the flex plates require the appropriate counter weight and that
supplies the 6-bolt holes
  -- The fly wheels have the counter weight built in.. unless you are using
an aftermarket flywheel, in which case most will bolt up to the counter
weight.  The aftermarket flywheels come in many different weights and
materials

Tracy used the RX-7 flex plate and his damper plate will not directly fit on
the RX8 flex plate or either of the flywheels.  The flywheels put the ring
gear in different locations from each other, with the n/a RX7 being smaller
than the Turbo RX7/RX8.

But I have not been able to figure where the RX7 auto flex plate puts the
ring gear in relation to the flywheels (though it seems to have the same
number of teeth as the turbo RX7/RX8 flywheel)

Tomorrow afternoon I will be able to get to the hangar and let you know the
size of the -7 flex plate relative turbo flywheel.  Since the flywheels are
already really beefy, I was hoping there might be an easy adaptation of one
that would put the ring gear and damper place in the right spot...  but that
is seeming more and more unlikely.